I don't know what the current status is with gnome 3.8 and gentoo, most packages seem to be there but there was one issue that I ran into earlier today that I can't seem to fix maybe someone can.
Why does brasero-3.8.0 still rely on tracker-sparql-0.10? which I have tried tracker 0.14 and the latest 0.16, the master commit shows 0.16 but still show 0.12 in the ebuild.

I did manage to load gnome-session 3.8, couldn't open sound settings without opening control panel first and didn't see class-mode anywhere unless it was a session with GDM which I also didn't see.
Also thought SystemD was slow compared to arch linux anyway that is.

Brasero now builds, and do you really need to change init systems for gnome 3.8?...

I was out of date on my xorg-server, still running 1.11, so had to update to 1.13 (latest stable). Not 100% sure, but looks like the new GDM doesn't work with an old server like 1.11.
I have forgotten which, but one package also depended on GCC 4.7, so I had to update that too as I was still on 4.5.

I also had trouble resolving libsoup and libsoup-gnome. Looks like libsoup-gnome is no longer needed. At least I don't have it on my system any more, only libsoup itself. I unmerged libsoup-gnome to resolve the blocking. Everything seems to be working fine so far.

I was out of date on my xorg-server, still running 1.11, so had to update to 1.13 (latest stable). Not 100% sure, but looks like the new GDM doesn't work with an old server like 1.11.
I have forgotten which, but one package also depended on GCC 4.7, so I had to update that too as I was still on 4.5.

I also had trouble resolving libsoup and libsoup-gnome. Looks like libsoup-gnome is no longer needed. At least I don't have it on my system any more, only libsoup itself. I unmerged libsoup-gnome to resolve the blocking. Everything seems to be working fine so far.

Mons

Hey monsm, DO you have Gnome 3? Amazing!!!! Can you help me to try it in my gentoo? I have some problems and i don't know how resolve it ... I'll appreciate it =)

Uhm, I'm afraid I'm a bit dump. Are you saying, that you don't write your own package.unmask, but symlinking from the gnome overlay? If so, how do you ensure that the gnome overlay installed on your comp is not used completely?
(Hope you get me)

Yes, I did to no avail. No it even gets worse: the monitor goes into suspense during boot-up, and the computer is beeping some hyperactive error-code. At the same time, the Xorg.log is essentially the same.

Quick question, is the most current Gnome 3 version in the unstable branch 3.6?

Yes, currently as of 06/15/2013 the Gnome 3 version in the unstable branch is Gnome 3.6 - and to be honest I have no idea why Gnome 3 is so slow to be updated in Gentoo whereas KDE seems to be updated within a few days or a week or so of it's latest releases.

I should note too however that Gnome 3.8 is in portage, but it's hardmasked. There is a thread on the forums as to what packages to unmask if you want to "try at your own risk"._________________Linux. Freedom. Power.

I was using stable branch for quite some time. I switched to unstable only to find that there was only gnome 3.6 available for install. I was running KDE 4.10.3 and when I updated to unstable KDE got updated to 4.10.5 and things started getting messy. The Icon for Applications Tab in K Menu got screwed and I could not get that bloody thing back. Reinstalled KDE same thing.

Sorry for this long background.. None the less I decided to Unmask Gnome 3.8 and then emerge gnome..

Here is what I did.

1) Remove the entries for GNome8 Mask from /usr/portage/profiles/package.mask
2) Make a backup of the package.mask
4) emerge --sync
5) Put the backup copy back to /usr/portage/profiles
6) emerge gnome

I got stuck with totem not emerging because of econf failed and some python related issues. I masked 8.2.3 and emerged 8.2.2 version which went fine.
After this I got stuck with gnome-terminal failing again with python related issues. So I did

eselect python list and selected option 2 to set python version at 3.3 and then emerge gnome again.

This time it went perfectly fine.
Installed gnome-shell-extensions to enable gnome classic mode( Which was the only reason I emerged gnome)

I chose to not upgrade X from 1.12 and stuck with ati-drivers version 13.1 Legacy version. I have fantastic Graphics performance. I think I am going to stick with Ati legacy drivers for as long as possible.

Have been running Gnome 3.8 now for about a week, and everything is mostly stable, apart form a few little glitches.

Just as everyone else here seems to have done, I unmasked the required packages by copying the Gentoo 3.8 masked section in /usr/portage/profiles/package.mask as is into my /etc/portage/package.unmask

I'm not a great fan of globally accepting ~amd64, because a good number of packages which have nothing to do with Gnome are running absolutely fine and stably (libc, X, binutils, kernel, etc...). So I spent a lot of time figuring out which packages to keyword in /etc/portage/package.keywords. Mostly this was a question of straightforwardly doing what emerge told me to do. The biggest hurdle was getting rid of libsoup-gnome. Indeed libsoup-2.42.2 now includes what used to be in libsoup-gnome, so the 2 are now incompatible. A number of packages unrelated to gnome (e.g. banshee, midori among others) still depend explicitly on libsoup-gnome. The solution was to remove libsoup-gnome and run emerge -pt @world to find out which packages were still trying to pull in libsoup-gnome. Fortunately every one of them had a more recent version which allowed depending only on libsoup-2.42.2, and so I added all of them to /etc/portage/package.keywords also.

Once everything was compiled and installed, I ran into one glitch which caused the "Settings" app to crash when adding Online Accounts. The solution is quite complex, but now resolved. Details here: https://bugs.gentoo.org/show_bug.cgi?id=475954

My system is an Apple MacbookPro6,1 (17", 2010 model). I use its discrete nVidia GPU (there is also an integrated Intel GPU), since vgaswitcheroo on Apple macs is still a bit of a mess. Linux boots in EFI mode (using elilo 3.14). Software versions:

No way to get gdm accepting tcp connections for remote display, seems to ignore totaly the conf file (custom.conf)
3D games are very slow
Animations are slow
No mem leak fixes, it's even worse : the shell mem usage grow by 10-20 Mo steps if you periodicly change the background, as i do.

gcc-4.7.3 (~amd64. The upgrade is necessary to compile gnome 3.8; it cannot compile with gcc 4.6)

If Iam on 4.6 and just want to try gnome 3.8 do I have to rebuild my whole system/world/toolchain for 4.7? If so I wont try it because its simply a pure waste of processor energy and time and my electricity bill gets more happy....... I already spent more than one day to solve those libsoup-gnome issues ... now my energy to solve dependency-problems is empty